Western Atlas International, Inc.

Kjt Enterprises, Inc.

Kurt-M Strack

Leonty Abraham Tabarovsky

Michael A Frenkel

Xiaoming Tang

Alberto G Mezzatesta

Keeva Vozoff

John Jiang

Azizuddin Abdul Aziz

Ying Liu

Christopher C Payton

A geophysical data acquisition system includes at least one geophysical sensor. The at least one geophysical sensor has associated therewith a signal generator configured to generate a signal corresponding to a type of the at least one geophysical sensor. The system includes at least one signal acquisition unit having a plurality of input channels. The at least one geophysical sensor is in signal communication with one of the plurality of input channels. The plurality of input channels each includes a detector for receiving and identifying the signal generated by the signal generator. The at least one signal acquisition unit includes amplification, filtering and digitizing circuits automatically configurable in response to the type of sensor identified by the detected signal.

Geophysical data acquisition system

A single well transient electromagnetic ('TEM') apparatus and method is disclosed. The invention includes a wireline logging tool adapted for disposition in a borehole drilled in earth formations that has mounted thereon an electromagnetic transmitter and electric field transmitter for applying electromagnetic energy to the formation that will maximize the radial depth of penetration of the energy into the formation. The logging tool further includes an electromagnetic receiver and electric field receiver for detecting the electric field and magnetic field components created in the formation by the TEM transmitter. The electromagnetic transmitter and receiver preferably comprise three-axis electromagnetic coils, and the electric field transmitter and receiver preferably comprise three-axis electric dipole antenna elements. The tool may employ an array of the TEM transmitters and TEM receivers spaced axially along the tool in the borehole.

Method and apparatus for measuring transient electromagnetic and

A method of joint inversion processing acoustic velocity and electrical resistivity well log data. The method includes generating an initial model of earth formations over an interval of interest. The initial model corresponds to earth formations for which the acoustic velocity and resistivity well log data have been measured. The initial model includes layers each having a geometry, a value of resistivity and a value of acoustic velocity. Acoustic velocity and resistivity data are synthesized based on the initial model. Differences are determined between the synthesized data and the measured data. The initial model is adjusted and the steps of synthesizing the log data and determining the differences are repeated until the differences reach a minimum, thereby generating a final model of the earth formations. The step of adjusting includes determining a coupling relationship between the acoustic velocity and the resistivity for the earth formations, and generating an inverse Jacobian matrix of sensitivity functions of the resistivity and acoustic velocity with respect to the geometry and the coupling relationship.

Joint inversion processing method for resistivity and acoustic well log

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Houston, TX, United States of America

Kurt-M Strack